Re: "./contrib/gcc_update --touch" doesn't work with make

["H. J. Lu" <hjl at lucon dot org>]

On Tue, Jul 02, 2002 at 09:58:05PM +0200, Gerald Pfeifer wrote:
> On Sat, 29 Jun 2002, H. J. Lu wrote:
> > ./contrib/gcc_update has
> >
> >     while ${MAKE-make} -f Makefile.$$ all | grep . > /dev/null; do
> >       sleep 1
> >     done 2>&1
> >
> > It won't work at all if you run it inside a makefile. You will get
> >
> > make[1]: Leaving directory `...'
> > make[1]: Entering directory `...'
> >
> > instead of empty line. For gnu make, I think you can use
> >
> >     while ${MAKE-make} -s -f Makefile.$$ all | grep . > /dev/null; do
> 
> If you just want to add -s to make, this is portable, as far as I can
> see, so please go ahead and commit your change with a proper ChangeLog.

It turns out that -s still doesn't work in all cases. I didn't bother
to track it down. I just put a break in the while loop. A different
approach may be to compare the outputs between 2 runs, like

old=
new=`${MAKE-make} -s -f Makefile.$$ all 2>&1`
while test "$old" != "$new"; do
  sleep 1
  old="$new"
  new=`${MAKE-make} -s -f Makefile.$$ all 2>&1`
done 2>&1


H.J.